// 打印类属性、方法定义
/* eslint-disable */
const Print = function(dom, options) {
  if (!(this instanceof Print)) return new Print(dom, options)

  this.options = this.extend(
    {
      noPrint: '.no-print'
    },
    options
  )

  if (typeof dom === 'string') {
    try {
      this.dom = document.querySelector(dom)
    } catch {
      var createDom = document.createElement('div')
      createDom.innerHTML = dom
      this.dom = createDom
    }
  } else {
    this.isDOM(dom)
    this.dom = this.isDOM(dom) ? dom : dom.$el
  }

  this.init()
}
Print.prototype = {
  init: function() {
    var content = this.getStyle() + this.getHtml()
    this.writeIframe(content)
  },
  extend: function(obj, obj2) {
    for (var k in obj2) {
      obj[k] = obj2[k]
    }
    return obj
  },

  getStyle: function() {
    var str = '',
      styles = document.querySelectorAll('style,link')
    for (var i = 0; i < styles.length; i++) {
      str += styles[i].outerHTML
    }
    str += '<style>' + (this.options.noPrint ? this.options.noPrint : '.no-print') + '{display:none;}</style>'
    str += '<style>html,body{background-color:#fff;}</style>'
    return str
  },

  getHtml: function() {
    var inputs = document.querySelectorAll('input')
    var textareas = document.querySelectorAll('textarea')
    var selects = document.querySelectorAll('select')
    var canvass = document.querySelectorAll('canvas')

    for (var k = 0; k < inputs.length; k++) {
      if (inputs[k].type == 'checkbox' || inputs[k].type == 'radio') {
        if (inputs[k].checked == true) {
          inputs[k].setAttribute('checked', 'checked')
        } else {
          inputs[k].removeAttribute('checked')
        }
      } else if (inputs[k].type == 'text') {
        inputs[k].setAttribute('value', inputs[k].value)
      } else {
        inputs[k].setAttribute('value', inputs[k].value)
      }
    }

    for (var k2 = 0; k2 < textareas.length; k2++) {
      if (textareas[k2].type == 'textarea') {
        textareas[k2].innerHTML = textareas[k2].value
      }
    }

    for (var k3 = 0; k3 < selects.length; k3++) {
      if (selects[k3].type == 'select-one') {
        var child = selects[k3].children
        for (var i in child) {
          if (child[i].tagName == 'OPTION') {
            if (child[i].selected == true) {
              child[i].setAttribute('selected', 'selected')
            } else {
              child[i].removeAttribute('selected')
            }
          }
        }
      }
    }

    for (var k4 = 0; k4 < canvass.length; k4++) {
      var imageUrl = canvass[k4].toDataURL('image/png')
      var img = document.createElement('img')
      img.src = imageUrl
      img.setAttribute('style', 'max-width:100%')
      canvass[k4].setAttribute('style', 'display:none')
      img.className = 'isNeedRemove'
      canvass[k4].parentNode.insertBefore(img, canvass[k4].nextElementSibling)
      img.parentNode.setAttribute('style', 'width:100%')
    }

    return this.dom.outerHTML
  },

  writeIframe: function(content) {
    var w,
      doc,
      iframe = document.createElement('iframe'),
      f = document.body.appendChild(iframe)
    iframe.id = 'myIframe'
    //iframe.style = "position:absolute;width:0;height:0;top:-10px;left:-10px;";
    iframe.setAttribute('style', 'position:absolute;width:0;height:0;top:-10px;left:-10px;')
    w = f.contentWindow || f.contentDocument
    doc = f.contentDocument || f.contentWindow.document
    doc.open()
    doc.write(content)
    doc.close()
    var _this = this
    iframe.onload = function() {
      _this.toPrint(w)
      setTimeout(function() {
        document.body.removeChild(iframe)
      }, 100)
    }
  },

  toPrint: function(frameWindow) {
    try {
      setTimeout(function() {
        frameWindow.focus()
        try {
          if (!frameWindow.document.execCommand('print', false, null)) {
            frameWindow.print()
          }
        } catch (e) {
          frameWindow.print()
        }
        frameWindow.close()
      }, 10)
    } catch (err) {
      console.log('err', err)
    }
  },
  isDOM:
    typeof HTMLElement === 'object'
      ? function(obj) {
          return obj instanceof HTMLElement
        }
      : function(obj) {
          return obj && typeof obj === 'object' && obj.nodeType === 1 && typeof obj.nodeName === 'string'
        }
}

export default Print

